Lewis & Short

Moesi, ōrum, m.,

  1. I. the Mœsians, a people in the modern Bulgaria and Servia, Plin. 3, 26, 29, § 149; 4, 11, 18, § 41; Tac. A. 15, 6; Juv. 9, 143; Inscr. Orell. 4984.
    Hence, Moesĭa, ae, f., the country of the Mœsi, Mœsia, the modern Bulgaria and Servia, Plin. 3, 26, 29, § 149; Tac. A. 1, 80; 2, 66 et saep.
    As Moesia superior and inferior, also in plur., Moesiae, Suet. Vit. 15.
  2. II. Derivv.
    1. A. Moesĭăcus, a, um, adj., of or belonging to Mœsia, Mœsian: exercitus, Suet. Vesp. 6: copiae, Tac. H. 2, 32.
    2. B. Moesĭcus, a, um, adj., of or belonging to Mœsia, Mœsian: gentes, Plin. 4, 1, 1, § 3.